Coding Challenges
Explore our collection of coding challenges and practice questions. Filter by topic, difficulty, and more to find the perfect challenges for your learning journey.
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Understanding JavaScript Array.prototype.flatMap vs Map and Flat Methods for Array Transformation
Medium
ArraysMapFlat
Using WeakMap to Implement Private Properties in JavaScript Classes
Hard
Weakmap
Understanding JavaScript Optional Chaining (?.) Operator with Objects and Null Checks
Easy
Nullish coalescingObjects
What does the HTTP status code '200' mean?
Beginner
HttpHttp codesStatus codes
Fix Race Condition in React Weather Dashboard's API Calls
Hard
ReactAsyncRace conditions+3
How to Fix a Delayed Counter Update in React Using useState and setTimeout
Easy
ReactReact hooksClosures+2
Find the Longest Word in a Sentence
Easy
JavascriptString manipulationArrays
React Todo List: Fix Delete Button Not Working Due to Incorrect Event Handler Binding
Easy
ReactEventsScope+1
How to Create a Personalized Greeting Message Using JavaScript String Concatenation
Beginner
StringsConcatenationVariables
Understanding 'this' Context When Storing Object Methods in Variables in JavaScript
Medium
ObjectsJavascript
How to Stop Async Function Execution After First Promise Error in JavaScript
Hard
AsyncAwaitError handling+1
JavaScript Notification Handler: Processing Multi-Language User Notifications with Optional Chaining
Medium
ClassesPromisesError handling+1
Calculating 5-Minute Rolling Average Response Time in JavaScript Performance Monitor
Hard
Data structuresMapPerformance monitoring+1
Understanding State Changes in a Custom Time-Travel State Manager Implementation
Hard
State managementReducersImmutability
Implementing an Auto-Expiring Cache System with setTimeout in JavaScript
Hard
CachingTimersMap+2